温故知新ASP.NET 2.0(C#)(2) - Themes(主题)

using System; 
using System.Data; 
using System.Configuration; 
using System.Collections; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Web.UI.HtmlControls; 
 
public partial  class Themes_Dynamic : System.Web.UI.Page 
{ 
         protected  void Page_Load( object sender, EventArgs e) 
        { 
 
        } 
 
         protected  void Page_PreInit( object sender, System.EventArgs e) 
        { 
                 // 动态修改Page的Theme要在Page_PreInit方法中实现 
                 if (!String.IsNullOrEmpty(Request.QueryString[ "theme"])) 
                { 
                        Page.Theme = Request.QueryString[ "theme"]; 
                } 
                 else 
                { 
                        Page.Theme =  "blue"; 
                } 
        } 
}